631613 has 2 divisors, whose sum is σ = 631614. Its totient is φ = 631612.

The previous prime is 631597. The next prime is 631619. The reversal of 631613 is 316136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 573049 + 58564 = 757^2 + 242^2 .

It is a cyclic number.

It is not a de Polignac number, because 631613 - 2⁴ = 631597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315806 + 315807.

It is an arithmetic number, because the mean of its divisors is an integer number (315807).

2⁶³¹⁶¹³ is an apocalyptic number.

It is an amenable number.

631613 is a deficient number, since it is larger than the sum of its proper divisors (1).

631613 is an equidigital number, since it uses as much as digits as its factorization.

631613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 20.

The square root of 631613 is about 794.7408382611. The cubic root of 631613 is about 85.7992885584.

Adding to 631613 its reverse (316136), we get a palindrome (947749).

The spelling of 631613 in words is "six hundred thirty-one thousand, six hundred thirteen".